Remarkably Weak Anisotropy in Thermal Conductivity of Two-Dimensional Hybrid Perovskite Butylammonium Lead Iodide Crystals
Remarkably Weak Anisotropy in Thermal Conductivity of Two-Dimensional Hybrid Perovskite Butylammonium Lead Iodide Crystals
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DOI：
10.1021/acs.nanolett.0c04550
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发表时间：
2021-05-03
期刊：
影响因子：
10.8
通讯作者：
Tian, Zhiting
中科院分区：
文献类型：
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作者：
Li, Chen;Ma, Hao;Tian, Zhiting
由交替的有机层和无机层组成的二维（2D）杂化有机-无机钙钛矿是一类新的层状结构。它们在光伏、光电和热电应用中引起了越来越多的兴趣，在这些应用中，了解它们的热传输特性是至关重要的。我们对二维丁基铵碘化铅晶体的热输运性质进行了实验和计算研究，发现它们的热导率非常低（低于0.3 W m（-1）K-1），层状晶体之间的各向异性很弱（约为1.5）。进一步的分析表明，独特的结构与优先排列的有机链和复杂的能量景观导致适度较小的声子寿命在面外方向和可比的声子群速度在面内和面外方向。这些新发现可能会指导未来设计具有各种应用所需热导率的新型杂化材料。
Two-dimensional (2D) hybrid organic-inorganic 10 perovskites consisting of alternating organic and inorganic layers are a new class of layered structures. They have attracted increasing interest for photovoltaic, optoelectronic, and thermoelectric 10 applications, where knowing their thermal transport properties is critical. We carry out both experimental and computational studies on thermal transport properties of 2D butylammonium lead iodide crystals and find their thermal conductivity is ultralow (below 0.3 W m(-1) K-1) with very weak anisotropy (around 1.5) among layered crystals. Further analysis reveals that the unique structure with the preferential alignment of organic chains and complicated energy landscape leads to moderately smaller phonon lifetimes in the out-of-plane direction and comparable phonon group velocities in in-plane and out-of-plane directions. These new findings may guide the future design of novel hybrid materials with desired thermal conductivity for various applications.